Analog-To-Digital Converter (Adc); Adc Introduction; Adc Main Features; Adc Functional Description - ST STM32F40 Series Reference Manual

RM0090
11

Analog-to-digital converter (ADC)

This section applies to the whole STM32F4xx family, unless otherwise specified.
11.1

ADC introduction

The 12-bit ADC is a successive approximation analog-to-digital converter. It has up to 19
multiplexed channels allowing it to measure signals from 16 external sources, two internal
sources, and the V
single, continuous, scan or discontinuous mode. The result of the ADC is stored into a left-
or right-aligned 16-bit data register.
The analog watchdog feature allows the application to detect if the input voltage goes
beyond the user-defined, higher or lower thresholds.
11.2

ADC main features

●
12-bit, 10-bit, 8-bit or 6-bit configurable resolution
● Interrupt generation at the end of conversion, end of injected conversion, and in case of
analog watchdog or overrun events
●
Single and continuous conversion modes
●
Scan mode for automatic conversion of channel 0 to channel 'n'
●
Data alignment with in-built data coherency
●
Channel-wise programmable sampling time
●
External trigger option with configurable polarity for both regular and injected
conversions
●
Discontinuous mode
●
Dual/Triple mode (on devices with 2 ADCs or more)
●
Configurable DMA data storage in Dual/Triple ADC mode
●
Configurable delay between conversions in Dual/Triple interleaved mode
●
ADC conversion type (refer to the datasheets)
●
ADC supply requirements: 2.4 V to 3.6 V at full speed and down to 1.8 V at slower
speed
●
ADC input range: V
● DMA request generation during regular channel conversion
Figure 34
Note: V , if available (depending on package), must be tied to V
REF–
11.3

ADC functional description

Figure 34
channel. The A/D conversion of the channels can be performed in
BAT
≤ V
REF–
shows the block diagram of the ADC.
shows a single ADC block diagram and
Doc ID 018909 Rev 4
≤ V
IN REF+
Table 48
Analog-to-digital converter (ADC)
.
SSA
gives the ADC pin description.
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